AUX vs COMFORTSTAR: heat pump ratings compared
Against heat pumps of the same size and type, a typical AUX model beats 52% and a typical COMFORTSTAR model 50%. AUX rates slightly higher overall.
Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated
AUX
52%
of similar heat pumps beaten by its typical model
About average149 models listed
COMFORTSTAR
50%
of similar heat pumps beaten by its typical model
About average133 models listed
- Efficiency on a 5°F dayCOP at 5°FAUX: Beats 62%COMFORTSTAR: Beats 51%
- Heating power kept at 5°FCapacity at 5°F vs 47°FAUX: Beats 51%COMFORTSTAR: Beats 48%
- Winter-long heating efficiencyHSPF2AUX: Beats 43%COMFORTSTAR: Beats 54%
- Summer-long cooling efficiencySEER2AUX: Beats 51%COMFORTSTAR: Beats 49%
- Hot-day cooling efficiencyEER2AUX: Beats 40%COMFORTSTAR: Beats 44%
Average (50%)Dashed outline: the other brand, for comparison
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Rebate standards
CEE 2025
- AUX
- 68%
- COMFORTSTAR
- 53%
Xcel CC
- AUX
- 63%
- COMFORTSTAR
- 47%
CEE Advanced
- AUX
- 1%
- COMFORTSTAR
- 2%
ENERGY STAR CC
- AUX
- 44%
- COMFORTSTAR
- 30%
Top cold-climate picks, ductless 2 tons
Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.
Showing Ductless, 2 tons (21,000–26,999 Btu/h cooling). What size is my system?
AUX
- 1AM3-H24/2DR3BAUXAlso listed as ASUM24HPMULO2 tons · 24,000 Btu/h · DuctlessKeeps 108% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
- Heat kept at 5°F
- 108% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.10 (COP at 5°F)
- Good
- Seasonal efficiency
- 10.5 (HSPF2)
- Great
- 2ASW-H24F6A2/ *R3DI-D7with ductless indoor unit ASW-H24F6A2/ *R3DI-D7AUXAlso listed as ASW-H24F6A2/**R3DI-D72 tons · 22,400 Btu/h · DuctlessKeeps 85% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 85% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.10 (COP at 5°F)
- Good
- Seasonal efficiency
- 10.5 (HSPF2)
- Great
- 3AFEB24HP230V1COwith ductless indoor unit AFEB24HP230V1CHAUXAlso listed as ASW-H24F8A2/*R3DI-C7, ASW-H24F8A2/**R3DI-C72 tons · 23,000 Btu/h · DuctlessKeeps 87% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 87% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.20 (COP at 5°F)
- Great
- Seasonal efficiency
- 10.0 (HSPF2)
- Good
COMFORTSTAR
- 1CHF3-24CD(O)with ductless indoor unit TIP3-24CD(I)COMFORTSTAR2 tons · 23,400 Btu/h · DuctlessKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 95% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.23 (COP at 5°F)
- Great
- Seasonal efficiency
- 11.6 (HSPF2)
- Top 10%
- 2CPP3-24CD(O)with ductless indoor unit FPA3-24CD(I)COMFORTSTAR2 tons · 24,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 76% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.27 (COP at 5°F)
- Great
- Seasonal efficiency
- 11.1 (HSPF2)
- Top 10%
- 3CMZ3-30-4ZCOMFORTSTAR2 tons · 26,000 Btu/h · DuctlessKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 70% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Seasonal efficiency
- 9.5 (HSPF2)
- Below the middle
These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.
Next steps
The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.
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